Fixes for Try-It Feature involving 2nd line paragraph marring and repeated numbering

Two fixes for the Try-It feature as submitted by W&N completed involving the ability for the 2nd line of a paragraph to wrap underneath the numbering as well as fixing the repeating of the numbering in a subsequent question 

1. 2nd paragraph line now wrapping neatly underneath Try-It numbering.
2. Exercise default title hidden so now repeated numbering and title "Exercise 1.0" does not show.  (1.0 default was displaying in second question.